Remeron and concentrate

hey my name is kaylen and i have been taking remeron for about 5 months now. i liked it at first as it definetly helped me sleep soundly and not wake up to a throbbing head. i especially liked that it helped me to concentrate about 50% better than i had been after a sudden and unexplainable extremely deep depression. i have been diagnosed with bipolar and OCD and have been on a host of other medications but am now on lithium, klonopin, seroquel, and remeron. the thing that irritates me about remeron is how HUNGRY i have been. and its not even that...i eat when i am not hungry at all, i just cant stop it. i have gained 50+ pounds in 5 months and i cannot understand why this medicine has to have this effect. can anyone relate?