What kind of workup was done before blaming all of this on anxiety? (originally)

Paroxetine is amongst the worst SSRI in regards to GI effects and probably #1 regarding weight gain (you stop taking paxil or switch to a different SSRI/class, you should lose a bit of weight, not 50 pounds, but that's a part of the weight loss explanation right there)

What do you mean by work-up? (My doctor is very big into blaming anxiety/depression)

Anything really, like bloodwork, exams etc

Just a lot of bloodwork, but no he won't send me to a specialist.

your doctor just sounds like a homeless dude you met.

when he says workup he means what sort of assessments have led your doctor to blame anxiety?

Well if you read the story (wall of text haha) I stated about my anxiety and how I do have it. Although in the recent years I have learned to somewhat tame it for a living (happily) standard. Although he cannot budge on the fact that it could be something different.

if you're in canada you can register with a different doctor quite easily, I recently switched GP's to a practitioner located closer to me and also because I had heard seemingly negligent stories about my old GP. If you have a concern about something you could request other testing. An ultrasound of your abdomen is an inexpensive and risk free imaging test that could be used to characterize your abdomen a bit, though it has limitations in seeing many structures because of the higher air content