at a stand still

I work as an overnight stocker lifting 30 pounds and more every night. I was out on a weight restriction cause they found a cyst in my cervix.  I can not give my emploryer that note with out then immediately putting me on a leave of absence. I will be making no money for 6 and a half months as I am only 3 months pregnant. I told my night boss my issue and he said he would help me out a little but is still making me doing everything I was before. He hasn't even put me in an easier area which we have ! They may look for a part time position for me during days but that's a lay cut and hours cut. I don't know what to do 😕