you are allowing your fear to overwhelm you. Fear never a makes good decisions.
our bodies hurt sometimes. If you have arthritis, you HAVE arthritis. that stuff hurts. If it has gotten worse, see the doc again. It still isn't als , no matter what your anxious mind tells you.
my right elbow hurt for 2 or 3 months from no injury. I couldn't hold stuff with that arm well. It WAS weaker. A few weeks ago it cleared up. Coulda knocked me over with a feather. The cause was almost certainly nerve impingment issues. I have disk issues and such in my neck...But I am telling you it hurt like HELL. I told my husband that it could be time for an MDs help as I had waited long enough. then a couple of weeks later, it stopped. craziest thing ever.
REMEMBER: you could be a hypochondriac if you continually jump to crazed conclusions. You are doing this with your knee issue. There is acutal evidence of arthritis. don't go looking for the exotic here.