does the pain in your thighs increase when squeezing them, like they are sore? or only with walking? You mentioned it hurt at rest. Any chance you have had a viral illness
lately, or an ear infection as a type of viral illness? Do you have any type of arthritis, especially rheumatoid arthritis? There are variants of that illness where you can have generalized
muscle pain which is noted at rest, with squeezing the thighs and then also increased with walking. It can be related to cramping as your potassium, magnesium or calcium can be
in an abnormal range. I see you take calcium and Vit D, a good thing. But hydration with electrolyte containing beverages, with additional potassium and magnesium can be helpful for
cramps. The rheumatological problem is called polymyalgia rheumatic. But the tinnitus (ringing in the ears) could also be related to changes in potassium levels. For that evaluation, you need an audiologist and an ENT physician to examine your ear canals, especially with the fullness.