Your symptoms could be from MS, but it doesn't hurt to look into other explanations. Once you break into the world of autoimmune diseases you are more susceptible to other problems. I was diagnosed with fibromyalgia only 6 months after my MS diagnosis. Like MS, fibro produces heavy fatigue. It is also responsible for stiffness and soreness all over my body.
Your best bet is to discuss these problems with a doctor you trust. My primary care doctor tested me right away for rheumatoid arthritis and sent me to a rheumatologist to be checked for fibro. A good doctor should be able to point you in the right direction.