I am on tertacycline for Occular Rosacea and this past Sat walked on the beach for a bit , sat down to rest before I put my umbrella up and fell asleep. When I woke felt wrung out but went home and was ok till 2AM then woke up with extreme headache- fever-nausea and felt I had food poisening- My wife checked symptoms and then took showers- plenty of fluids, got temp down to just under 100 but slept from Sat evening till 8 AM Monday- I now feel much better- but am curious- I was warned about sun exposure and thought it was due to sunburn- could Tetra cycline have added to the problems ( fever- headache- nausea ) or was it a case of just too much sun ??? Felt so terrible and weak was going to go to ER but thankfully my wife got me in the shower and reduced my temp- ( Oh I also had difficulty breathing - hurt on deep breath ) fine now just weak .