Support needed

I had been drinking coffee for 20 years, and a heavy drinker for past 2 year I typically drinks black coffee (the south east asian type), which uses robusta beans, avg 4 cups a day. I can say, that about 1000mg of caffeine a day. I am a fairly active person that work out 3-4 times a week, easily 200 minutes of MVPA.

I had been getting anxiety issues, and nerve irritation, where my finger pinching happens often. One day,i decided to quit it cold turkey. Im also trying to lose weight as my BMI is hitting 29 though im athletic, and on a daily calorie deficit now. Averging losing 250g to 400g of weight a week

The first week of cutting coffee cold turkey is really bad. I felt like i am getting a heart attack. Massive headach/brain fog, anxiety, depression. I cannot concentrate at all. Paracetamol not helpibg either. Everytime i tried to focus, the headach worsen, and my heart pound harder. Every thought in my mind is pointing towards "im dying!"

Come the 2nd week, the anxiety subsided. Headach not as bad, but still there. Breathing normalize but ocassional heavy, but chest still tight. I sleeps better now. No more toss n turn trying to fall asleep.

I though the internet version of withdrawal takes 2-9 day is true, and i am coming out of it soon

Now,i am day 25 into no coffee, i still get the same symptoms

I wakes up feeling lack of energy. Chest tightness still there, but not as bad as the 1st week. Whenever i am at work work, im getting an after lunch crash where my brain stop functioning, and im feeling sick. I can literally feel a chill up my back and feeling nausea. My breathing still feels slight labored, and there is also a lingering weird feeling at my left chest whole day.

I went to see a cardiologist, and he ruled out any heart issues.

The brain fog is still happening. It comes and goes a few times in a day. I always feels better during and shortly after my mornning exercise (i usually do a zone2/3 for 30min in the morning), but it is short lived. The crash always comes around lunch time, and i always start feeling better with much lesser symptons in the evening

Last but not least, im always feeling cold now (no fever), the wind can just blow into my room and i feel chilly, even when the weather says its 28degree celsius.

And yes, i am falling sick easier now as well (previously i had years of not needing to see a doctor)

Is that normal on a coffee withdrawal journey or there is something wrong with me?