Thanks for sending across your query. Consultation is required. We will take your detailed history and perform a physical examination. Sometimes, the cause may be Gastroesophageal Reflux Disease (GERD), muscle strain, or pressure from sleeping on that side

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You need to visit general medicine,get further assesment done

There could be acid reflux or hiatus hernia. Please get endoscopy done to know the cause. Take small frequent meals,  avoid heavy meals,  late evening meals, fatty,spicy meals, excess of tea,coffee.

Need some more details kindly consult

Based on your history of acidity and palpitations, there are a few common reasons for this: ​Positional Acidity: Even though you take medication, lying on your left side can sometimes cause stomach pressure that feels like nausea or 'vomit feel.' This pressure can also push against your diaphragm, making it feel harder to take a deep breath. ​Heart Awareness: When you lie on your left side, your heart is physically closer to your ribs. It is very common to feel your heartbeat much more strongly in this position. For someone who already experiences palpitations and panic attacks, this sensation can feel like a 'breathing problem,' even if your lungs are functioning normally. ​The Feedback Loop: The discomfort of the 'vomit feel' can trigger your body’s stress response, leading to a mild panic sensation that makes your breathing feel restricted. ​Suggestions for Relief: ​Try the Right Side: If the left side is uncomfortable, try sleeping on your right side or propped up slightly with 2–3 pillows (inclined position). ​Meal Timing: Ensure your last meal is at least 2 hours before you lie down to reduce the 'vomit feel.' ​Thyroid Check: Since you are on thyroid medication, it is worth checking your TSH levels. If your dose is slightly high, it can worsen palpitations and the 'on-edge' feeling at night. ​Note: If you experience any sudden, crushing chest pain that spreads to your jaw or arm, or if the breathing difficulty does not go away when you sit up, please seek emergency care immediately.

Discomfort when sleeping on the left side can be caused by acid reflux or a hiatal hernia, which allows stomach acid into the esophagus. Other causes could be heart pressure, pericarditis, respiratory issues like asthma or a lung infection

You need to evaluate properly first. Better if you go nearby hospital for physical examination by general physician doctor.

Lung, musculo skeletal disorder, breast fat tissue disorders?

Can help you, kindly consult and provide detailed history for proper diagnosis and further management

Your symptoms suggest likely acid reflux (GERD) or positional reflux. This happens due to acid movement and diaphragm sensitivity. Cardiac cause is less likely if no severe pain, sweating or radiation

Need a few more details please consult for further evaluation and treatment

Get ecg done and have a follow up

Needs thorough assessment. Please consult .