Forearm, wrist, hand and fingers - help!

Honestly, I don't even know if I am posting this in the right place, but I figure I have nothing left to lose. Guys, I am distraught; I suffer from health anxiety, so it's not strange for me to go off the boil and become anxious over absolutely nothing, but I am desperately in need of some reassurance. 

For a while now, I have been suffering from pain in my forearm. Sometimes, it throbs or gives off a kind of burning sensation. Now, I wouldn't necessarily say it was painful, but it's certainly unpleasant. For a while, I was bad, because I was prodding at the arm, rubbing my index finger down the length of it, trying to identify the spot the pain was coming from. So, admittedly, I might have angered the muscles a bit. 

Over the weeks, though, things have gotten a bit worse. My left hand feels stiff when I open and close it. I occasionally get a bit of discomfort in my wrist. Again, not so much painful as unpleasant. The thing that worries me most, though, is that if I try to hold anything in my hand, like my phone or something, it feels like my hand and my fingers are kind of... twitching? Pulsating? It's the weirdest thing. I have had three different doctors diagnose this with three different things. Doctor one says I have tendinitus; doctor two says I have tennis elbow, and doctor three says he thinks it's simply muscle inflammation. The thing that unsettles me, though, aside from not knowing what it is, is... am I literally just gonna have to wait for it to get better by itself?

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