Why do I feel one-sided knee pain?

Muscle knots are usually caused by stress. Stress & tension later develops in the form of muscle tightness and discomfort called muscle spasms.
Regarding your slightly high lymphocyte count, if your doctors have reassured you that it is not a cause for concern, it's generally best to trust their expertise. Minor variations in blood cell counts can occur without indicating a serious health issue.

It's essential to consult a professional for a proper evaluation. In the meantime try gentle exercises, proper posture, heat/ice packs, and pain relief medications.

Looks like you're suffering from a lot of backache. Even though Lyrica and Neurontin kinds of drugs are being taken, back pain may worsen, and this may be a brand new problem or the deterioration of what used to be. You have to meet your doctor for a check-up to diagnose the cause of the recurrent pain. Sometimes, it is necessary to change your meds or use additional treatments to reduce the pain as much as possible. 

You could have what’s referred to as a bunion. A bunion is a bony bump that forms on the base of the big toe. Tight shoes or heredity can be the cause of it. If it’s getting swollen and larger, it’s advisable to wear comfortable shoes and apply ice to reduce swelling. In some cases, surgery may be necessary if it’s very painful.

Back pain comes and goe­s. But hurting for years is very bad. It might mean you have­ muscles that are tight or weak. Poor posture­ or not exercising can cause this proble­m. Also, sit and stand up straight. Going to a physical the­rapist can give you exercise­s to make it better.