Bone & Muscle problems

I had covid few months back ..I feel my lower thigh muscles weak (just above the knee) so when I walk slow my knee bends back (hyper extend) and legs become tired when I stand for longer time .. sometimes feets heavy ..I don't know where exactly is the problems I also feel muscles and bones are not much connected or support each although I don't have pain in any part of legs my b12 ,vit d calcium was normal ..I don't understand what's the issue is this any deficiency or I still need to take more protein diet ..please suggest experts ..

I used to drink water only 3 to 4 glasses a day from long time which i thought wasn't enough so i increased it to 8 to 10 glasses from last month, I suddenly got leg cramp (right calf) last night, which i had not gotten since at least 2 years. I did not excercise or do anything that would put my calf to any strain. I always thought dehydration caused cramps. So this did surprise me. What could be the reason? P.s I did drink less water (5 glasses ) on the day I got cramp. Can reducing water on just 1 day cause cramp?

I have been experiencing knee pain on my right leg since past few weeks. I don't have any problems while walking but my knee pains when I am climbing down the stairs and sitting cross legged and then I cannot get up comfortably. Thereafter the pain lasts for a few hours and I spray a pain relief. It's a bit swollen. I can see the knee swollen. Kindly suggest what I should do to decrease my swollen knee and the pain.

Fall down from step before two days...bandaged..taken xray..under medications... still pain and swelling is there

I'm having extreme pain in my right knee and soul of the feet while getting up or walking. I even have red spots which I've shown a dermat but no changes till now.

I was depressed about something and doing some work. Suddenly got a sharp pain in the left side of my lower back. I immediately sat down. But the pain and discomfort kept increasing and there was a point I couldn't sit properly and needed support to stand. Went to local doc, I'm better now. But still have trouble in bending and sitting and getting up. Feel some nerve issue. What is this and y a sudden pain ? Give anyone pleas explain

When I move my neck upward, I can't hold my position for long as I started shaking & frontal head becomes heavy. Sometimes internal shaking also. Also, when I keep my head down for a long time, same thing happens with vision problem.

He is having terrible back pain.X rays report done for examination of radiograph lumbar spine ap/lateral Report says - LUMBAR SPONDYLOSIS NOTED WITH DISC SPACE REDUCTION AT L2-L3,L3-L4 & BACK MUSCLE SPASM

I was stretching out my hip flexors cuz of tightness with the help of my feet and I cranked it bit too hard which induced my acl grade 1 sprain. Initially it was stiff for a week then it got fine but after few weeks instability crept in and my knee felt wobbly as if my lower limb would just separate out. So my current condition after 10 mnths  is such that there is no pain no swelling but instability is worse on my right leg. But it doesnt buckle but definitely can't turn around or walk sideways just walking in straight path and stairs is fine. What to do in such case I'm just trying cycling out as physio for my quads, hamstrings, calf, glutes those muscles feel a bit weak. How would I recover completely as I was before as this issue bothering me a lot and I can't be at my 100 percent and feel low on confidence whenever I step out. Because of this issue my hips, my back, my neck everything is getting compensated. Share your advices Asap. I have attached my mri do check it out. Thanks.

So I got suddenly numbness in area from elbow to wrist . Almost unable to use my right hand , also having breathing issue (taking asthalin ) .