Started exercising after 3-4 yrs, are symptoms normal?

I'm male in my mid twenties. It has been 3-4 years years since I've had any regular exercise. My diet is ok - no fast food etc., and I'm not overweight. I am definitely unfit though - slightly high BP (143/86) and my "average" heart rate over a day is about 100. I have a desk job and stress is definitely a problem for me. I almost never smoke or drink alcohol.

I spent the last ~5 years of my life on a plethora of mental health meds, mostly antipsychotics. At first all was ok but I eventually noticed an allergic reaction to all of them, as well as a very high resting heart rate. I came off them slowly and have been off and mentally ok for about 3 months.

I also have something of an addiction of coffee and for a couple of years, my strong coffee consumption was higher than my water consumption. Every time I had a blood test (for the head meds), all was ok but the red count was high - we guessed it was dehydration. In the last 2-3 months, I've cut down the coffee and drink at least 1L of water a day.

I really want to get in shape. I know it's going to be a challenge but should it be this much of a challenge?

4 days ago, I managed to run 0.9km in 8 mins before feeling very tired, That in itself doesn't surprise me that much. However, I felt just a little nauseous and breathing made my chest feel dry. I haven't done anything strenuous since then but I still notice that my chest feels dry.

It might still be dehydration - I sweat a fair bit and usually wake up with a dry mouth. I just wanted to make sure it's not unusual.

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