Thanks for all these additional details.
I am sorry to hear about your problems.
Well, from the description and considering severity of pain, I would suggest that you should not delay and rush to ER ASAP.
Having swelling and very severe pain should be clinically evaluated by doctor.
Your doctor may suggest x-rays to ensure that the bone is not broken.
If the ligament is only partially torn, your doctor will probably immobilize your thumb joint with a bandage, cast, or splint until it heals.
Please see doctor in ER ASAP and get this issue managed.
Hope this helped
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