In my experience, once I picked up a drink after a period of sobriety, knowing I needed to quit, the after effects were magnified. I couldn't just drink in peace, if you know what I mean. I realized what was at stake. Most of it was mental and emotional shame that I did it again after saying I wouldn't. That compounded the physical misery.
Let go of that torture. Beating yourself up won't undo what's been done. You learn from the experience and walk on with your head up. At least you are trying. Sixty days is great. Tweak your plan and method of staying quit. Double up. Be kind to yourself.