I usually overthink a lot which causes stress.and i keep getting aphthous ulcers frequently. docs of healthtap have written to take one bcomplex everyday for ulcers. i should take with or without zinc? and for how long?3months,6months,1year?

Experiment and relax: If you have found that a combination of particular medications produce relief, and you can't reduce the stress, keep going with what works. You might want to reduce the dosage and frequency. Aphthous ulcers are stress related so stressing about is not going to help, but eliminating the cause of stress will probably help a lot.