Have Cat Questions? Ask a Cat Vet Online.
HI this is DRB and I would be happy to help you with this....if your kitty is having a cough then I would recommend Vetriscience DMG (support for immune system) and lysine chews both of which can be ordered right online. These will help your kitty get better much sooner. I would also suggest some liquid Doxycycline (do not use capsules or tablets as it can cause esophagela issues) given once daily for 14 days. If your cat has any secondary infections especially like mycoplasma this will help him feel better much sooner. It also treats alot of other infections. Doxycyline will have to called into a compounding pharmacy.
As far as the pain you have mentioned I would bet that is coming from repeated fluid administrations.....this can cause pain especially if it is done behind the neck between the shoulder blades.
Also if your cat is not eating then your vet should give you some cyproheptadine at 1 mg twice daily to help with the appetite.Kitties cannot get better if they don't eat.
I hope this helps you but please let me know if you have any additional questions.
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Please let me know if I can be of additional help as I check my computer each night. Sincerely,DRB