joy is right my dr. told me nothing more than 20-25lbs. Your gonna need to have someone help you or get another caregiver to take up the job so you can transfer to someone who needs a little less caring for.
I did IHSS (In home support services?) for my grandmother for about 7 mo. and it got to the point where I had to lift her, but she was barely 110lbs. I'm now pg. 2 1/2mo. And haven't been caring for her (other family stepped in to help) for the last 8mo.
Good luck!
You're not supposed to lift more than 15-20 lbs.