Hi, Welcome to Health care magic forum.
As you describe, you are using the slimming pills and having some problem with the heart.
The pills are usually central stimulants, and usually have cardiac stimulant action for some people. If it is so it may be difficult to reverse them. they may apparent some times only so may be difficulty to diagnose in the beginning.
Avoid the calories, fats, oils, junk foods, fleshy fruits like guava, and banana.
Practice, morning walk,
yoga, gardening, and house hold works like cleaning, keeping things in order etc.
Minimize the sleeping time, practice late to bed, and early to rise. Avoid the day time sleep.
wishing for a quick and complete recovery. Thank you.