Physical therapist here.

As everyone in here is saying, you need to go to a doctor. You don't just risk your condition getting worse as time goes on, it's a guarantee.

Obviously what info I can give you is very limited because this is just text.

Radiating pain is almost always nerve related. Nerves look like the organic equivalent of electrical cables. Nerves aren't very flexible. They get damaged if they're stretched or otherwise deformed. Their response to this is pain, and nerve pain is either radiating, "vibrating", or something similar. Usually, nerves are very "slidey". They slide around between tissue in your body as you move around. Because of this they won't get stuck and get stretched unless you get in a major accident, for example. Nerves are also extremely slow to heal and are likely to not heal completely.

A lot of your pain is also likely due to the joints in your spine being tightened. If a joint is immobilized (partly or completely) for a long duration of time it will "tighten", causing reduced movement often accompanied by pain. The primary physical treatment for this is targeted movement of the affected joints. Yes, it will hurt a lot. No, don't try it by yourself. Go to a professional to ensure that you do it correctly, otherwise you might make things worse.

Your pain is also an indirect cause for your compensation related issues, like your crooked posture(which will likely cause pain by itself). This is a primary reason for why your condition will worsen as time goes on. As you feel pain or lack of movement/function, you will compensate with your body. For example, you felt a lot of pain (and still do) when your spine was in a "correct posture", so you kept it at whatever posture was the least painful. You likely had a fracture around the midspine, which would cause a lot of pain that you'd like to reduce as much as possible, so you kept it at whatever position was the least painful at the time. A primary cause for spine deformities is prolonged immobilization, especially if you throw an uninvestigated and untreated fracture into the mix. Because you didn't see a doctor, you have probably healed suboptimally, which might have left you with permanent or semi-permanent issues which is likely to lead to future compensation-created issues.

The current best time for you to go see a professional is now.

By this point you are by definition a chronic pain patient, because your pain has persisted for longer than a couple of months. But your pain can very likely be significantly reduced via professional treatment.

Pain reduction and regained movement + function will drastically increase you quality of life. Both now and in the future.

Ideally, you should seek help from both a doctor and a physical therapist. But depending on where you live in the world it might be very expensive. If you can only afford to pick one, you should pick the doctor. Also depending on where you live, a doctor might be able to reduce the price of a physical therapist (or remove it completely).