Once I hurt a finger in the same way, landed badly jumping off a ladder to avoid stepping on a shrub. Can’t do this to your thumb, but I taped it to its neighbor for awhile. Turned purple, but I could tell the bone was not broken. After about 6-8 weeks I went to a hand specialist because it still hurt if I gripped in a certain way or put pressure on it. I thought that should be totally healed by then. Doctor took x-ray — the bone was indeed fine, just cartilage damage. The doctor told me it would heal on its own but it might hurt for up to TWO YEARS. I said, “Two years???”, he said, yes, believe me it will take a long time to completely go away. And he was right! It gradually got less-and-less sensitive and after 1.5 to 2 years no pain at all.