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I am so sorry Austin has this trouble. The best thing to use on his eyes is damp teabag. Just dab it on 3 times a day. The tanic acid in the tea will sooth and lower the PH of his tears. That should stop sores forming where the skin is irritated.
For sores anywhere on the body dab on honey. It is a remarkable healing agent.
For allergies Austin may have any of these:
Benadryl at a dose of 1/2 of a 25 mg tablet given twice daily or
Chlorpheniramine at a dose of 2-4 mg twice a day or
Claritin (Loratadine) at a dose of 2.5-5 mg/cat or
Zyrtec (cetirizine) 5 mg once or twice a day
It is important to ensure that the formulations used contain ONLY the antihistamine and are not combination products (e.g. Claritin-D contains pseudoephedrine, which could cause very significant adverse effects in a cat).
Please let me know how Austin is doing.