Wellbutrin has many generic versions and some are better than others. Walgreens will carry one version and the grocery store will carry another so it pays to call around to check generic versions.
Unfortunately, frustratingly, it can take several months to get a drug, try it out and see how it's affecting you. It really helps to have a good doctor who will work with you and listen to you. You also need to educate yourself on your condition and the treatments out there. It seems daunting but the more you work on it the better it gets.