Back Story: 22 Year Old Mother Of Two. My Mother

Back story: 22 year old mother of two. My mother was diagnosed with MS and passed away several years ago. Symptoms did not appear till after my second pregnancy.

I have been suffering from pins, and fire feelings in my hands and feet since I had my second child. It has gotten worse, becoming an every day thing. My legs are giving me issues with stiffness and pain. I went to my PCP who told me I had nothing to worry about and all my blood work in normal. What should I do? It's getting to the point the pain is stopping me from daily activities with my family. I also have wide spread pain, PCP said I "looked to healthy to be in pain" vary upset and not sure what to do next. Please help!