I did lose strength in that arm this morning when doing triceps exercises with 20 lb weights in both hands.
Thanks for posting your query
From description it seems you might having TFCC(triangular fibrocartilage complex) tear- ligament between distal radius, ulna and ulna and carpal bone.
I would suggest getting this evaluated by an orthopedician for an accurate diagnosis and appropriate...
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The swelling near the pisiform is likely to be due to tendonitis but since the swelling is compressing the nerve and a visible muscle weakness is there, the extent of affection needs to be determined by MRI so that surgical treatment can be considered.
I hope this...