when I look back through my journal of early post treatment your symptoms are the same as I had. I saw a physiotherapist to help teach me how to stretch out my sciatic and piriformis muscle and I kept at them with consistency. You will get there. It does take time.
I had some ups and downs over the last year as your body will have some changes. It seems that with every 2 steps forward you do take 1 back but slowly you are moving in the right direction.
I was good then bad and then good again and then bad again. New symptoms new pains but you eventually get acquainted again with your body.
Now a year out I'm doing good. It took some changes with my prescription for peripheral neuropathy as that developed about 5-6 mths out of treatment and I had to learn what my bowels can and cannot handle. I worked very hard on strengthen my core muscles and getting my muscles tones to keep my hips stabilized. But here I am and I'm doing well! I thought I was gonna need Advil or pills forever to not feel old and disabled but now I barely take anything other then my prescription.
Work with your GP. Have post treatment appointments with your GP to go through issues. I found the oncology team really wasn't helpful when it came to post treatment issues. They are great for follow ups on scans and making sure nothing is coming back but they were not so good with the issues related to treatment. They seem to be the specialist in getting rid of the cancer but leave you hanging with the issues related. They would say oh this or that is normal but wouldn't help with what to do about it.
If your GP doesn't know how to deal with these issues ask them for a referral to a dr who specializes in post treatment.