need help for relactation

dear all,

My dear baby was born 0n 15th oct 07 & running into his 6th month.He was on BF exclusively for the first 3 months.I was willing to keep him on BF only till he completes 1 year but owing to sum illness i cudnt feed him for 2 months almost & put him on Lactogen which he really likes & gainig weight also.My problem is that now I want to restart BF but milk produc is almost dried up espec. in left breast since generally in nights he takes right breast so there is very low supply in right side bt 1-2 drops in left breast.I am thinking of purchasing a breast pump as i have resumed my office work as well.Pls advise me what are the ways to have the same supply back.I cant offer him breasts very frequently to him since I am away throught the day.i was taking Dalia daily during lactation time & supply was good.Can i express milk with my hands to increase its supply because without good supply its senseless to invest in a pump.I need sum assurance also that it is possible to restart lactation otherwise i m really too tired after my offce hours to experiment things .I am living in a nuclear family so i have to manage evrything alone household works,office works and baby needs.I desperately wants to give breastfeed in nights so that i may have a sound sleep otherwise my baby wakes me up twice in night for feeding.
Thanks in advance,
mkclg