I am a human bug magnet. They all love me - mosquitos, May flies, you name it.
If I have nothing else, I use anti-itch cream (like hydrocortisone) but don't rub it on the bite, which increases the itch. I put the cream on a bandaid, then put the bandaid over the biggest bites so it holds the cream in place - I find more is absorbed and nothing rubs off on clothes, bedding, etc. It also prevents scratching.
During the day, a paste of baking soda/water can help. I use a natural anti-inflammatory and actually open the capsule and make a paste with the powder. That works better than anything because it has healing properties as well as anti-inflammatory ones. If I have to go somewhere or if the bite is in a place where it will rub off (like on the back of my thigh), then I top it with a bandaid. That also keeps the paste moist so it doesn't dry out.