Why do I feel worse after chemo ended than during?

Back in February I was diagnosed with Grade 3 Triple Negative BC. My treatment plan had me start with chemotherapy first before having a lumpectomy, then a few months later a double mastectomy and reconstructive surgery. I just finished with my chemotherapy last month and from about a week after I was done until now, I have felt worse than when I was on it. Extreme fatigue and horrible muscle and joint pain - to the point where it hurts to just move. I’m wondering if it is some sort of withdrawal from the chemo drugs or even all the steroid injections that I was given with the chemo (bi-weekly for 8 weeks, then weekly for 12 weeks). Has anyone had this same experience after their chemo was finished?