Go away!

Have been suffering from gastric lately and those pills that I took seemed not effective. Actually gastric is not something new to me, and I manage to put it under control these one or two years. But somehow I'm experiencing this prolong gastric pain again not because I forget my meals or I don't have them on time but is more of a 'emotion and stress' issue. I feel 'acidic' in my stomach all the time, perhaps too much gastric juice being secreted due to tensed mind.
My stress is not coming from the undergrads neither some major issues at hand (you'll know when the time is right). The undergrads so far I'm coping okay except that I have to spend some of my time monitoring them. It improves after I decided to be active with them rather than staying passive. I myself have also learnt from them (教学相长). The other issues are actually not too difficult as they can be sorted out as long as I work on them. I think my deepest inner fear or worry that is causing this gastric problem is that I'm in my 3rd year of PhD and I'm still not getting anywhere compare to 1.5 years back. Although my boss ever told me that it's normal that a PhD drags on to more than 3 years (so I expect myself to complete labwork in 4 years), I can't help telling myself that time is running short and I still have not manage to produce any good or worth publishing data. And I feel like running away from everything- I should have just quitted! But that's not me. If I could do it, I won't be suffering from gastric now. I'm not someone who let go easily, I have to move on. Yet, I need to really learn to release myself from such anxiety and overcome the fear.
Go away, anxiety! Go away, gastric!