Thanks for your question on Healthcare Magic.
I can understand your concern.
At your age of 18 years, heart diseases are uncommon.
So no need to worry for major heart related diseases.
For muscle spasm related pain, do you following things for better symptomatic relief.
1. Avoid bad postures in sleep.
2. Avoid movements causing pain.
3. Avoid heavyweight lifting and strenuous exercise.
4. Apply warm water pad on affected areas.
5. Take painkiller and
muscle relaxant drug.
Don't worry, you will be alright with all these.
And yes, try to loose some weight and stay fit and healthy.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.