Chronic Waswas in Salah?

Not letting them bother you will lessen the affect on you. If you get waswas it means you have faith, shaitan doesn't try to bring down someone who is already astray so instead of feeling anxious realize that it is a sign of faith Alhamdulilah. Don't worry about them too much because they don't affect your deeds (unless you act upon them) After prayer make dua that Allah (swt) will make it easier for you and say aouzu billahi min al shatain ar rajeem every now and then.