Severe pain in hand, had for over a week, serious replies only please.?

A while back I noticed that every now and then my right pointer finger knuckle would swell and it would become very sensitive. Eventually it reached a point where I can't bend my finger back, and I can't make a fist.

I've been tested for RA and several other things, went for an MRI and went for X-rays, I've been given Nabumetone 500mg and was recently uped to 750mg because the pain and swelling is so intense. It hasn't done anything, I get no relief at all. I was told it could be tendinitis but the symptoms don't match.

I ice my hand and I use a heating pad but there is no relief. I've wrapped my had and end up having to take the bandage of because the swelling becomes so intense that it hurts.

If I catch the side of my pointer finger in the slightest wrong way, I get a sharp pain but it usually goes away.

This is the first time I have ever experienced a pain this intense and sometimes it either takes over the whole hand or just stays between my pointer and middle finger, but my pointer finger is completely swollen. I have a slight bump between the two that sends sharp pain as soon as it is touched and I nearly jumped out of the chair in the drs office when he pressed on the knuckle of my pointer finger.

I get some temporary relief if I run my hand under cold water but that's about it. The antiinflamitories and OTC pain meds don't even slightly dull the pain.

Sometimes my pointer finger swells up to the point that my nail slightly turns purple.

I'm also noticing a pain that's been traveling up my arm.

Has anybody else experienced this and if you have, what were you diagnosed with? How long was it before drs figured out what it was? Is there a way I can stop this.

Please serious answers only.