I feel your pain on the heat front, just had to close the windows as the mozzies are biting me and now it's roasting.
Obviously only you know about your drugs and how they affect you, just be careful. Remember they can make you drowsy (even though they say non-drowsy) and if you take them now and in the morning, you'll be more doubling up tomorrow's than today's (if that makes sense!).
Hope you find something that works. My friend had this stuff that looked like lip balm that she put round (up??) her nose that relieved her symptoms, though I have no idea what it was, but someone else might!