I vomited 5-10 minutes after eating a handful of cachews and almonds. do you think its because of a nut allergy?

Possibly: Stomach upset and vomiting after eating nuts are possible signs of an allergy. It can happen within minutes to hours. It very well could be unrelated to an allergy too. It's not unreasonable to try another exposure to cashews and almonds individually and see what your reaction is. Please, seek urgent help if you develop breathing issues, severe pain, swelling anywhere or lightheadedness.