Anxiety is usually more ongoing but it can also be related to specific incidents. Your brain will feel worried.
Panic attacks are usually unexpected, or "out of the blue". They start suddenly instead of building up over time. Panic attacks can cause very strong reactions like sweating, pounding heart, an inability to breathe, or a desire to run / hide. They feel more physical than anxiety. There's a part of your brain that is triggered into survival mode like an animal being chased. It feels like fear or danger, more than every day anxiety.
I have a diagnosed panic disorder which means this can happen to me a lot, even for no reason. It makes me scared to leave the house sometimes (often?) because I never know if it will happen in public.
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And in the end, the love you take is equal to the love you make.