Hello. Thanks you for your question. Sorry to hear about your symptoms.
A black and painful toe usually results from a problem called "cholesterol embolisation".
During an angiogram, cholesterol plaque can be dislodged and can travel through the body. It is a very rare complication.
Risk factors include
1. Advanced age
4. Elevated weight
5. High cholesterol and or triglyceride levels
In mild cases the patient won't notice symptoms. In more significant cases, cholesterol travels and lodges in the small arteries in the toe and blocks blood flow making the toe change colour. The toe can be painful but will gradually get better. It can take a few weeks. The toe should gradually return to a normal colour and may become itchy or the skin may peel. You should see the GP every week while healing is occurring.
In severe cases, the kidneys can be affected and kidney function may deteriorate. Patients normally become very sick when this occurs and need to stay in hospital.
There are no specific treatments. I would use medications to open up the small arteries in the toes to help with healing.
Hope this information is helpful.