I am suddenly allergic to sunscreen, neutrogena brand. What brand should I try?

Physical blocks. Depending on which neutrogena sunscreen you reacted to, the most common sun screen allergen is oxybenzone and its derivatives. You can switch to a sunscreen that contain only physical blocks such as zinc oxide or titanium dioxide. Remember to reapply every 2 hours while in the sun.
Vanicream. The vanicream brand of products were developed by a dermatologist at mayo clinic. They have a sunscreen that lacks the usual compounds that trigger allergy. They are easily available and no need for prescription.