Deinfitely get all the blood tests the dr has suggested. There is definitely something haywire! Only way you could GAIN that much is to eat & eat & eat never moving a muscle.
I also have to ask...do your clothes fit tighter? 35 lbs would be at least 1-2 sizes!! Believe me, I'm just sitting here shaking my head...something is WHACK!
Good luck. I know what you mean about it feeling like a friggin' pin cushion. I did when the drs were trying to figure out why I felt so much fatigue & chronic aches. I unfortunately had to give up the quest...insurance got too costly.
Don't give up! Let us know what is found!