Male cats do not go into heat (or estrus), only females.
Have you owned this cat all his life, or did you just adopt him? Do you know if he was used to going outside? If he was it will take time for him to learn to be an indoor cat. Try and distract him with toys or catnip, if he favours it.
Since he was only neutered two days ago, it could take a month for the bad smell to go away from his urine, but it WILL go away. Just be patient.
Since he is 11 years old, being neutered is harder for him to adjust to and he is probably somewhat uncomfortable.
IN the meantime, try giving him two litterboxes. Some cats are very fussy, so make sure you keep the boxes clean.
Watch his incision and make sure there is no swelling or a lot of redness there.
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