I have never had an issues of swelling, crippling pain, or redness from using short esters like Test Prop and Tren Ace. And I see more and more people complaining about the long esters causing pain, swelling, and redness.
I was always told not to ice it. But I wouldn't even use gear that put me through so much pain I had trouble walking. If it improves considerably by tomorrow, you could try another injection and see if you react the same. But it sounds like a gamble to me. If you respond better to short esters, maybe you should stick with short esters (though you have to do a lot of spot rotating to avoid build up of scar tissue
). Hope you feel better, and was it Test cyp or Test Enan?