Hello Friend, Good that you are seeking a help. Mood swing is a symptoms of stress and depression. You may be thinking too much about Career or, exams, or  job or relationship etc. As body an mind are interlinked, such emotional tension influences body through high or low BP, inflammation,  skin allergy, migraine, digestion issue, acidy, dullness, lack of appetite etc. Looks like you are experiencing some of them too. So the solution is first isolating the root cause for your stree or depression. If you can do it by yourself, it's good. Else take a psychology counseling support to get a holistic view of your current suitation. You can choose online options through Practo app, which is effective and time saving. Reach me online for further evaluation.