Anxiety question?

So this may be a dumb question but can anyone explain how you feel when you have anxiety? Does your anxiety happen randomly or only during certain activities. I’ve dealt with anxiety for years now but now it seems to be getting worse. I talked to my doctor about my symptoms and she said that they can be caused by anxiety but I have never dealt with anxiety this bad so I wonder if it’s something else. During rough times I get dizzy, feel hot, insides feel shaky and legs feel weak. After these attacks my muscles (mostly thighs) are sore and am fatigued. They don’t happen daily. Also some mornings I just wake up and feel anxious. Thanks for reading and please share your symptoms and if your anxiety happens for no known reason