@Sarahsarah2312 - If this usually happens after you've had too much to drink, could you try a few weeks without alcohol, to see what happens?
I used to be very allegic to certain insect bites and have had various lotions, potions and pills to address the impact over the years. In my dotage, I'm either not bitten as much or handle the bites better.
The other thing that could be in play, if this is all fairly recent is dehydration. I appreciate that what I am next about to say is counter-intuitive, but it's true - when I am dehydrated my hands, feet ankles and sometimes eyes become puffy. In fact, in my OH, his first sign of dehydration is puffy ankles. We discovered that when living in the Tropics where it was very easy to be dehydrated.
After all that ramble, alcohol also makes us dehydrated, so that could be in the mix, if not the total root cause.
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@helensaramay I'd urge you not to link everything to diabetes. It'll only increase your stress levels. Of course, be checked out, but don't go on to auto-worry settings.
I hope it all clears up for you.