Wise words from
@Deleted User01 ^^^^^^^^. If in doubt,use the elimination process.
Sounds very much like appendix to me,maybe liver or kidney so make sure the Doc does a Liver Function test and full blood analysis.
Can you expand on the source of the Kava?
Is it noble certified?
Either way I'd stop and do exactly what Deleted User01 said.
No concomittent Alcohol or GABA'ergic use i.e. Sedatives?
Have you looked into Adrenal burnout?
I don't know how stressed you are and for how long but it can go hand-in-hand with Anxiety.
Being the weekend (no GP maybe til Monday?) stay hydrated too but make sure you are getting enough salts along with the H2O! Not NaCl(table salt). Get some type of organic,ethically harvested sea salt like Himalayan,Celtic etc. that has a broad spectrum of minerals, as if it's a kidney thing then you want to cleanse and nourish the cells. You will know pretty much by the smell and colour of urine/feaces as to how all these organs are functioning.
Definitely get back to us on this and take care.