Firstly, it's completely understandable to feel concerned about changes in your body, especially when they involve pain and discomfort. Your health and well-being are important, and it's always better to err on the side of caution when it comes to medical issues.

Given the symptoms you've described, such as sudden appearance of stretch marks, pain, swelling, and increased weight in your left breast, it's advisable to schedule an appointment with a healthcare provider as soon as possible. These symptoms could indicate various issues, including hormonal changes, inflammation, or even more serious conditions such as infections or tumors.

As a trans man, it's also important to find a healthcare provider who is knowledgeable and sensitive to your specific needs and concerns.

Remember, there's no need to apologize for seeking help or asking questions about your health. Your well-being matters, and seeking medical advice is the responsible thing to do when you're experiencing concerning symptoms. Your doctor can provide you with a proper diagnosis and guidance on the next steps to take. Take care of yourself, and don't hesitate to reach out for help when you need it.

Let us know how you get on at the doctor's today.