The side of my tongue hurst really bad it hurts to talk and eat what is this from? I hope it's not a std! Please help! This happens every often

Glossitis. Nutritional deficiency of Niacin can cause painful inflammation of tongue called pellagra. There are associated skin, gut & psychiatric symptoms. It wouln't hurt to take additional vitamin b3 but it would be an even better idea to see your doctor first.
Tongue. A variation of candida can do this. So can a food allergy. Did you have any recent dental work befor this? Malocclusion , a dental problem can be a cause as can mervury sensitivity. There are other causes so check with your physician.
Need more info. Please see your provider. There is no way without seeing it directly to get a feel for what this could be.