I know how you feel. I am starting my postgraduate and already missed my introductory class because my anxiety was just uncontrollable. I get the works when bad, shakes, dizzy, disorientated, brain fog etc etc, and even when not, I still have physical symptoms all day. Fatigue and headaches being the worst when trying to focus in lecture. Sometimes it's like being in a drunken state, it's scary. Sometimes struggle just getting to uni though panic states, let alone getting through 3 lectures in the day!First off, don't panic. Anxiety fuels are thoughts into overdrive, last week I convinced myself I was going to fail because I couldn't even make it to a class!. Calm down, take a step back and rationalize. This is important. There are two options you can go down really. Seeking GP help to see if there is anything they can suggest to help you manage your anxiety (therapy and medication). Propranolol has helped me dramatically to calm down. Next, speak to your uni. They should have a student support system in place to help you tackle this issue. Counseling through uni will be a lot faster than NHS and CBT or therapy helps a lot. Also, they can advise on what is best to do with you course. Trust that they have probably dealt with countless of students in the same shoes. They will know exactly what to do and how to make the course work for you.Last year, they offered to record my lecturers using a webcasting service so I could watch it in my own time if I missed it. The only downside is you miss discussions, but you get the context behind the power point slides at least. Anxiety is horrendous and I do feel for you. Hope something works out.