My husband had 3 epidural injections of Kenalog 10 80mg for a her...

My husband had 3 epidural injections of Kenalog 10 80mg for a herniated disc in the neck. A few days after the last injection he has muscle weakness, insomnia and severe fatigue. Can this be due to the injections? His doctor said that she had never heard of this happening before. I am really concerned. Also I have read that the patient should eat a high protein diet, and to let the Dr know if you are on a low sugar diet. My husband has been on a low sugar diet also and I am not sure if this is affecting him along with the injections???