attack of the 'what ifs'

Anxiety is kicking my ass lately.  What if I never...?  What if X happens? 

I've tried several methods to quiet my brain, but I can't seem to get ahead of this.  I've tried guided meditation, walking in nature, weightlifting, socializing, alcohol, distractions, and talking to a trusted friend, among other things. 

I'm at my wit's end and not sure how much longer I can endure. 

My stomach is in knots, and I have to force myself to eat.  It usually wears off in a few days, so I'm hopeful I can stick it out until then.  Wish me calm.