What is the best way to deal with stomach issues caused by stress im currently trying chamomile tea and gental yoga is there anything more i can do to calm myself down?

I have been very socially awkward my entire life but after a long time of shutting myself away I feel I need to get out there and start enjoying life again but don't know how or where to start I get panic attacks just going to the shop :/ I don't want to be this way forever where do I start?