On the verge of a break down, please help

A little background about my home, 3 straight rooms, to reach room no 3 one has to pass through the living room, then my bedroom, then the 3[SUP]rd[/SUP] room (MIL’s room), then there is a lobby, kitchen, and restroom. The WIFI cable in my room and internet signals strong in my room only. Lack of privacy in our house, whenever someone visits, I make sure that between the living room and my bedroom, curtains are drawn however, if someone visits in my absence, MIL doesn’t bother about all this and says how does it matter if someone peeps into your room through the living room. I have had many arguments with her because when I am at work and visit home early, I would see her entertaining guests in my bedroom!! After a lot of struggle, I stopped this and have told her strictly that I can’t tolerate this nonsense. People will either sit in the living room or if you want, your room, never mine and things started improving a bit thereafter.
Now for the past few days I am having a very hectic schedule at work due to closing so I would reach pretty late. Day before yesterday the moment I entered home, I saw a friend of MIL sitting in the living room. I spent a full 1.5 hours with her repeatedly because my MIL said my friend has come to see you, to meet you, she wants to spend time with you, etc. etc. and I was dead tired by the time she left.

Now yesterday when I reached home, I was shocked to see a girl who is a neighbor, sitting on a chair, in my bedroom, with her legs spread on my bed!! I asked my MIL what's the matter why the hell she is there?? MIL told me that she has come to use your WIFI connection! On top of it, my MIL was serving her cold drink when I was trying hard to send her off! I had to act very blunt and told that girl to go into the living room as I had to change and I took pretty long to change the clothes. But that shameless girl again entered the room when I unbolted the door between my bedroom and the living room. Then I spent a lot of time in the washroom to show her clearly that I wouldn’t entertain her. After that I went outside the house into the verandah pretending that I was talking on the phone. I think the signals were enough for her and she finally left!

Now when I entered the home I confronted my DH (who was yesterday working from home and was on a con call when that girl came and left. My DH was roaming with his hands free in the bedroom and living room while she was shamelessly surfing the net and my MIL was practicing the harmonium in the living room. My DH said why are you over reacting if she used the internet in our bedroom? What is the big deal? I was appalled by his cool reaction. I told him how would you react if some guy would sit like this in my bedroom at the pretext of using bloody internet? If it was so urgent can’t she go to a nearby café which is just a block away? I just can’t come home and tolerate nonsense. My DH just brushed away my reaction and said you are making a mountain of a mole hill and by that time, I got really pissed off. Looking at my reaction, my MIL again played a game of high BP. Whenever I have an issue with anything and have a tiff, she starts behaving like an attention seeker by pretending to faint and starts crying. I immediately rushed outside to call the doc, but my DH stopped me.
I told my DH and MIL that I just can't stay in this suffocated environment where if I raise my voice over a pertinent issue, then MIL falls ill, I said if something happens to her because of me then I won't be able to take the blame and I am leaving for my parents right away.
Having said that, I started packing while my DH plainly ignored all this and was attending to the MIL wholeheartedly. When MIL saw that I actually started packing she immediately came to my room and started crying please don’t go etc. etc.… I said no ever since I came I have been trying to bear with this nonsense of neighbors and relatives and instead of understanding and supporting me, you don’t take any action to guard your house and fall ill to change the subject.
My MIL dint let me go to my parents and I am extremely depressed. My DH dint give two hoots to anything and continued working on his laptop.

I feel highly depressed.

 

Is my problem too trivial for anyone of you to reply?

 

No I dont pack my bag always and pretend to leave...this is the first time that I did anything of that sorts because everytime I blow the whistle my MIL faints or shows that she has gone epileptic, I just cant take it anymore and it takes us months to channelize things annd withing minutes everything goes for a toss..iam suicidal