Hi Alissa,
I am 5 weeks post chemo and was also having bad muscle problems, I couldn't even squat to reach the toaster in the pantry without pulling myself up the cupboard - I was also having little stumbles when my legs didn't seem to want to co-operate ie getting in and out the car - but I'm happy to report it has mostly subsided - each morning before getting out of bed I did some basic stretching and went for short walks even just around the garden as I was too tired - also used the heat pack some nites in bed.
I agree with one of the other posts - emotionally at the end it can take its toll and depending on the type of chemo it may also be cumulative so your body is at full chemo impact and you feel real yuck - keep smiling it will get better soon .
Julie xx