yea I had to go outside because of summer classes (and on nature trails) I did get burned the other day I put a lot of sunblock on the sunburn seems to have now turned into a tan...but yes my skin was very sensitive.
My heat intolerance started almost a year before I was on antibiotics, and only worsened during that time. Since starting antibiotics, it improved. So in my case, I don't see it as a side effect.
HOWEVER, be careful taking doxy, particularly this time of year. I am not on, nor have I taken, that drug. But I've read it causes extreme suns sensitivity, to the extent that some doctors won't even Rx it in the summer months! User patsy10, our community leader, knows more about this than I do so maybe she'll comment or else send her a note/post a new thread to ask about this.
I have heat tingling too...i am wondering is this Lyme or could this be my antibiotics since I am on Doxy twice a day and should not be in heat but I had too...
Joint pain and swelling/effusions certainly can be symptoms of Lyme. In fact, before it was called "Lyme Disease," it was called "Lyme Arthritis." Luckily, joint erosion is rare with Lyme! So while it may feel nasty, permanent damage is unlikely.
As I recall (though my brain is sieve-like and prone to error), "Surruh" is college-aged and athletic/healthy other than this undiagnosed malaise. So while JackieCalifornia makes a good point that most people would feel worn out from a day's hike around the zoo, based on your age and health reference it may be more worrisome.
My heat intolerance has improved after many months on antibiotics. However, for a long time, my weird sensory/neuropathy-like symptoms were agitated by heat. I eventually had tingling in my face, hands, feet constantly. But the heat would make it go "nuts."
So, getting into a hot car in the summer would almost instantly cause any tingling to enhance. If my whole body got hot (exercise or in a hot environment) than all of my tingling would get worse. If I was cooking and got a burst of steam in my face, or some other local exposure to heat, than only the affected area would experience worsened tingling.
I've read others' comments that they don't tolerate heat well since they got Lyme, and I've also read that Lyme hijacks the body's temperature regulatory systems (thyroid etc), so all that might tie together.
Then again, a day out tromping around in hot weather is enough to make anyone's ankles swell. :)