Dear Sir, I Am 38 Years Old Man,Please Advise Me

Dear Sir,
I am 38 Years old man,Please advise me for my complains:
7 years ago I had sudden rise in blood pressure (152/100) with panic attack(Sweating,trembling etc).Cardiologist put me on Ramipril 10mg and alprazolam for 10 days.Checked pressure regularly it came down normal. Then I had to move to a different country and couldn't visit the cardio but I carried on taking medicine as ramipril 2.5 mg daily.everything was alright until last year I had dizziness,imbalanced feel like passing out ( like past symptoms) i check in A&E everything was normal except some ST changes in ECG which cardiologist told its normal. Cardiac enzymes,ECHO,Rpt ECG,BLOOD TEST for thyroid cholesterol all normal.I visited a cardiologist again and he told me not to take Rampril and check B.P. Which after stopping it is absolutely normal. Dr.Suspected may be Pheochromocytoma but B.P looks very normal now so he thinks its Anxiety.

I have Past history of Asthma (Asymptomatic).I am Non- Smoker,Non Drinker,with Normal BMI. No family history of heart Problems.

Current symptoms
Dizziness especially on walking little and eating ,
Feeling imbalanced,feels like passing out,
Occasional uneasiness in chest back of neck etc.
Morning is alright develops afternoon or evening.
ENT, ECHO- Normal, have episodic gastritis on Omeperazole as and when required.

Cardiologist feels its stress and Anxiety gave me Lexpro and betahistine. i haven't started yet coz I heard betahistine not good for Asthma and Pheochromocytoma. kindly suggest a treatment I feel my confidence is less of walking, i feel uneasy eating full meals.. Please advice.