Thanks for your query at DoctorSpring.com
I have read your question carefully.
I feel sorry to know all about your feelings about your therapists.I want to let you know that if your diagnosis is correct then every therapist tried well to treat you.Towards conservative side de quervein disease is treated by rest ,steroid injection, physiotherapy modalities like TENS and others.these modalities should be tried at least for 6-8weeks to see their effects.
If any of these modalities unable to treat this condition then this is known as refractory de quervein disease.The treatment of this refractory condition is surgical release of tenosynovium or covering over the tendon.
At present my straight opinion towards your condition is to have steroid injection in tenosynovium with a senior orthopedic doctor and do rest in splint for 6weeks.If you do not have relief after then go for surgery.
Hope this all will help you