Hi,
Cardiac issues usually does not present with
back pain. Now that a
stress test was negative, we need not worry about cardiac issues.
The cause for your back pain could be your full time desk job.
Now a days, it is very common in most of them on desk job or otherwise due to bad seating position.
You can follow a few things to get your back pain under control
1. Sitting position - back should be straight.
2. Reduction of weight could be helpful
3. Back exercises - atleast 20 minutes in morning to strengthen the back muscles
4. Avoid sitting too long and try to be mobile frequently.
5.
Physiotherapy help can be taken to strengthen muscles.
If pain is severe, you can take
NSAID group of painkillers.
Any further queries, happy to help again.