Talk to Psychiatry on Trouble Concentrating , Overthinking And Anxiety.

Assalam o Alaikum, I have been observing an issue for the past years. I've been a very quick learner and i was able to grasp concepts and learn new things easily. However from the past 2-3 years due to some reasons i have been under stress, I over think a lot and I get anxious easily now moreover I've been sensitive too towards scenerios and emotions before that i have been a debator and I've been a topper as well but now this anxiety makes me stressed out and depressed. I can't seem to study as i lose my concentration which is affecting my memory as well which isn't good because i have my entry test for medical university this year which requires cramming and learning and my complete concentration. I can't seem to take any hold of it however I can't stop myself from procrastination and overthinking. When i get anxious my hands start to shiver and i start sweating excessively as well Kindly guide me on how i can get back on track on terms of Learning and Concentration as i cannot risk