Holy cow, are you having skeeters like I am?? I mean, even walking out in my lawn, hordes of the bloodsuckers just rise up as one and then attack! I have plenty of anti-itch creme on hand.
But that brings me to my horse. I douse her with Zonk-It and the little widgets still get through. I've used Bug Blocker, same thing. At least the bug stuff is slowing them down. I would dread to think what my mare would have to endure without some sort of bug-stuff.
I even spray over my mare's head. She doesn't appreciate it at that moment but she does seem to understand that it's to help her. Even using the roll-on stuff, you can get dirt in their eyes and then they can try to scratch and do more damage or rub hair off.
My bug-zapper works overtime at home. Hubby thinks that there are easily 10K skeeter bodies in the bug zapper after 3 hours work. Pretty good hillbilly entertainment, watching the zapping going on, if you ask me. hehehe...
At any rate, do the best you can about keeping yourself and your horse safe and bite-free. All you can do is just keep trying. A cold snap is bound to happen sometime!!