How do I calculate the right dosage of CBD oil?

Calculating the right dosage of CBD oil for your pain depends on a lot of personal factors like age, body weight, the severity of symptoms, etc. Your symptoms sound quite severe, so you should be safer with starting at a higher dosage. It takes a bit of trial and error to get the right CBD oil dosage for your personal needs, but it has a relatively low risk factor so you should be safe to experiment.

Just be careful about taking CBD oil with other medications as there could be interactions between CBD and painkillers, among other drugs.

According to your symptoms, I would totally recommend 900mg. I used this amount for my mental health but it ended up healing my lower back inflammation, the tendinitis in my elbow and put an end to the migraines.