Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to examine you and obtain a history, I can not tell you what the exact cause of your symptoms is. However I will try to provide you with some useful information.
Your symptoms are unlikely to be neurologic in origin. While nerve problems can cause pain with decreased mobility, it sounds likey our restricted mobility is due to pain rather than weakness. Swelling in the hands and feet could be post-infectious, as occurs after a viral illness and is usually benign and resolves, sometimes it takes more than a week, sometimes a few weeks. However, rheumatologic problems like rheumatoid arthritis or other inflammatory arthritic processes may need to be excluded. Continued follow-up with your internist is recommedned.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.