A. This might be a sign of urinary inflammation and possibly a start of urinary blockage. This could be a very serious condition that requires a vet visit sooner than late.
When a cat gets fully blocked he could die in less than 48 hours. Reasons for blockage could be stress and bladder inflammation, urinary infection or urinary stones.
A. Those could be signs of a urinary tract infection (UTI). UTI in male neutered cats can be particularly dangerous as it can lead to urinary tract blockage. Usually accumulation of crystals in the urinary bladder and urethra is the most common cause for UTI.
I would recommend to take him to your veterinarian for a check up as soon as possible. A urine sample (if you can catch it) would be useful to your vet.
Some pain relief medications may be needed as well as he is showing signs of discomfort/pain.
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