I hear your outcry! What I can add to help you with your frustration, is to say that disc protrusions are dynamic. They are common in society, and the time of the day that your MRI was done - determine the amount of protrusion. This means, that Father Time and Movement as Healers, are involved.
Luckily, you were not operated immediately. An operation has risks, that are non-returnable. There are also no guarantees that you will be better off afterwards - as you said. As long as you know you do not have a fracture/cancer tumour, you have muscle strength and good balance in your legs, and bladder function, there is no immediate pressure to be operated.
May be consider another physiotherapist, as well as a biokinethetist to assist you in exercising your body. Also, keep in mind, that you need to be active for every hour that you sat - on a daily basis (life long). Consider sleeping on your stomach, and keep you weight under control (if your BMI is higher than 25).
An opinion on surgical procedures, is not the experties of a physiotherapist (myself). You are doing the right thing, get a few opinions from surgeons as well as other experts, and decide for yourself.
All the best,
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