Being told its carpal Tunnel buti am unsure

Bit of history:
I screen print for a living, alot of pressure goes through my wrist and hands whilst doing this.

Approx 3 months ago I used a pressure washer for hours, after I had an ache in right hand, not so unusual. Normally this would go, its been pretty consistent since. Pain in wrist (ache) pain ontop my hand, swelling ontop my hand in little spot just down from my first and second knuckle (makes my hand feel very stiff like cramps, I find rubbing it makes it feel better).

My hand feels weak, poor grip and the swelling comes and goes. Ache in my hand wakes me at night plus my forearm aches.

I've seen my GP twice, first Dr said it didn't look like RA but couldn't say what it was, seconds GP said it was carpel tunnel. 8m really not too sure what to think.

Does carpel tunnel come with swelling in the hand?

I am hypothyroid, tad overweight,my grandma had RA, right hand is dominat hand.

I've been told to get a splint and wear at night and if still have pain in 6 weeks go back. I've had no further tests.

Any help much appreciated.