Dealing with Health Issues on Vacation

Hello everyone, I've been dealing with some health issues that I've never really dealt with before. Every day I've been waking up with really crazy allergies, my nose is completely stuffed, I feel itchy all over. I take allergy medicine and it somewhat controls it. Besides that, I've had super low energy levels, I feel extremely tired. I've been feeling more irritable and anxious. I also seem to be having issues with my stomach where it always seems to be upset no matter what food I eat. My breathing has also been weird and I make a weird whistley noise when I breathe out deeply. I know I should go to the doctor probably, but I'm currently on vacation and I don't even know how I would go about explaining it or what tests to ask for. I looked up my symptoms and it seems my immune system is weakened, so I'm not sure how to help it. I sleep well, I exercise most days, and I get plenty of sun. Just wanting to know if anyone has experienced something similar and what you did to help it. Thank you :)