Hello! You are right that shingles vaccine is indictaed for persons above the age of 50-60 not for young age as you are mentioning because it is this age when the immune system is weakened and are more prone to reactivation of the infection in those you had chicken pox
earlier. For this pain you can try Tab carbamazepine
or Tab Amitryptiline which is very helpful.
For bleeding in stool, you havent mentioned whether it is painful or not and whether it is mixed with stool or they are separated. If it is painless and separated from stool most likely diagnosis is hemorrhoids whether he is constipated or not, what he requires for this is proctoscopy or may be sigmoidoscopy
examination for diagnosis and banding if they are there depending on the grade of hemorrhoids. if it is painful and notmixed with blood the it may be anal fissure
or some ulcer in rectum. If it is mixed with blood and associated with pain abdomen then you need colonoscopy
or may be sigmoidoscopy to diagnose the things. I hope this will help you. Keep in touch