2 years ago I experienced severe flu like illness. During acute illness, my legs ached and felt cold. Within 1 week, I went from running 10-15 miles per week to not being able to stand long enough to take a shower. Now I can walk for short distances but every night I pound on my legs due to deep bone ache and burn. Pain worse around tendons. Muscles also twitch all night long. Anyone else with similar experience?