Hello Doctor, my grandfather (Nanu) has Stage 4 prostate cancer and we are from Alwar, Rajasthan. He has severe pain from lower back/waist area to knees. Earlier, his testicles were surgically removed and currently he is on chemotherapy medicines. It has been 5 days since medicines started and he is gradually becoming weaker. Now he is finding it difficult to walk properly and we are very concerned. Could you please guide whether this is expected or urgent? Also, if needed, could you recommend a good specialist near "Jaipur", Delhi, or nearby areas? Could you please guide us regarding what kind of diet/food he should take during this time? Also, are there any foods we should avoid?