Danielson,

Welcome to NeuroTalk.

"I'm worried that it can be a clot near the hearts or lungs due to inactivity, since I have never left my home in the past month and half due to fear of having a relapse, it is possible? "

I would not worry about a clot. If you had such a condition, you would be in severe distress.

I think you could be experiencing one of two issues.
Anxiety can cause the symptoms you mention. or
A whiplash injury could be causing this.
Both can disrupt your breathing, even causing you to not breath until you feel short of breath. This can be nervous system caused and be a form of Central Apnea or it can be anxiety.

When I notice this, my doc ordered a complete exam including a treadmill cardiac stress test and an echo cardiogram. Both were normal.

I suggest you start getting active with walks or maybe some exercise machine workouts at low stress, low impact levels. I use a rowing machine twice a week. I row 4000 meters in 20 minutes.

The subtle neck injury from whiplash can cause inflammation that reduces blood flow to the brain. Restoring that can cause the sudden improvements as the neck settles into proper alignment. Keeping it that way while it stabilizes requires discipline to not aggravate it.

When you are not physically active, it is worthwhile to stimulate your brain in a low stress way. Manual activity doing things with your hands is good.

If this chest issue gets to be more than just shortness of breath and pressure, it would be good to have a doctor check it out, especially while you are symptomatic. Symptoms that come and go can be hard to define.

So get moving and distract your mind with other things, not your head and neck. You will likely see improvements. There is a Vitamin regimen in the Sticky threads at the top. It can help the brain tolerate stress.

My best to you.