Im feeling very tired, sore throat, headaches, achy thighs, dizziness and hot during the night which is stopping me get a good nights sleep. what could be causing this?

These are very nonspecific symptoms -- meaning they do not point to any particular medical condition. Any of up to a hundred different infections or other medical conditions could be responsible. If this has been going on for more than a couple weeks, or started recently but continues that long, get in touch with your personal physician. Good luck.