What causes intense anxiety (felt in the throat)?

hello Destiny

yes this sounds like a reaction to treatment

the source of most anxiety symptoms in tick borne infections is the problems they cause in the Central nervous system - usually from some form of inflammation

the limbic system - where our fight of flight response is generated is known for being particularly sensitive and often affected in tick born infections - in bartonella especially.

treatment with antimicrobials often causes worsening of these type of symptoms initially - and improvement in the long term

the mechanisms are not fully understood - but its likely that the treatment increases inflammation in the short term through some mechanism involving the immune system.

general advice is usually to modulate treatment dose / frequency to a level you can tolerate - and only gradually increase it over time.

people report some benefit from approaches that lower inflammation and or calm the limbic system in some way.
these vary from mind body work like relaxation or meditation, walking in nature,
or maybe epsom salt baths
to supplements - alka Seltzer gold, burbur pinella, passion flower tincture

often it takes some experimentation to find what works best for you

my ex had a lot of issues with anxiety and found 2 things most helpful
1, L-theanine - 200mg taken 2x a day
2, if it was extreme - laying on her back on the floor with her knees and lower legs up the bed and her arms out by her sides - a cardiologist suggested this when he heard her symptoms - and we were surprised it worked as well as it did - typically within1 minute the worst of an attack would pass

all the best