Oh goodness, seems like a streak of bad luck!
I was stargazing with my ex in our backyard once, we were laying in the long grass. Next day we got up and found ourselves covered in hundreds and hundreds of chigger bites! And we were going to an amusement park that day, so hours in the car and standing in lines.

We had scars for a couple months. No parts of our bodies were left un-munched. And they were living on us, even after showering! New bites showed up for a week. We had fun with it though, walking around the park looking severely diseased.

I've never once had pest problems when hammocking. They usually don't find their way in, except the mosquitos, but good bug spray and a hammock net easily takes care of that problem.