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Honestly...my fears are that you might be overtraining a bit. Doing a lot of back to back cardio...like running and elliptical, etc. That's really hard as the miles build up. I think you are doing great and have come SOOOO far....SOOOO fast. Just please be careful of that injury bug. I went full out last year and really had a brutal winter. So...listen to your body and take a few days off. I'm serious about that. Maybe rest a few days then ease back in. That heaviness you are feeling is just a sign of muscle fatigue. Maybe keep walking...because sometimes lack of movement makes everything worse. But allow yourself a few more days rest from the run and try it again later in the week.
Make sure you are icing too
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