What I would do as someone that does not even play a doctor on tv (as PaleoPhil once said.
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Take echinacea to help support the body's immune system. It needs to be taken at least 4 times a day to be successful and you need to be able to taste it to activate the brain's knowledge of its presence.
Hot poultices or baths - the most effective treatment - probably why your hot shower helped. They will open it up and let it drain.
Calendula as a poultice.
An area around the cyst (but not on the cyst!) I would use dmso with colloidal silver - mixed half and half. Whatever you do, do not put directly on the cyst as it can make it itchy. If it gets itchy in the place near but not on then you can put on coconut oil to relieve the itching. Some people are more sensitive to dmso in terms of skin. The dmso will take the colloidal silver into the body and head for the infection. The problem with the watery colloidal silver added onto the skin even if the skin is open is that the kind of cyst you have goes deep within the body. Topicals and oral applications will have trouble getting all the way in there - but not dmso. It will take that colloidal silver and bring it deep in where the infection is. DMSO needs to be in a glass bottle and it can make you smell bad - but it's a powerhouse of a solvent, will bring blood to the area (problem with cysts is that there is not enough blood flow) and will reduce swelling and pain. Apply with your hands, wash hands immediately (with only water) or do not touch anything at all and do not allow anything to touch the site until fully absorbed. DMSO is such a powerful solvent that it will transport things from anything you touch into your body - so you must be careful. There is nothing close though when treating an injury or infection in a specific part of the body without having to treat the entire body.
Repeat summary
Hot soaks and poultices
Herbs to boost immune system
DMSO and Colloidal silver to get to the infection where it is.
I promised myself I wouldn't do this kind of thing and give advice and get caught in the forum - just quickly scan to see if there was anything useful to me - but this can be a terribly painful thing to go through!
I don't know about not eating carbs - but I do know that the kind of "cheating" you did would make for toxins that could have to make their way to be consolidated and ejected from the body. I'm pretty sure that cheating on some fresh fruit or steamed veggies wouldn't have had the same effects.
Oh - and long term there are some yoga postures that are supposed to help. Maybe you can look them up? This kind of cyst tends to return as it goes deep within a canal. Hopefully the dmso and silver will get to it all - but maybe this will be a good thing as it could be really good incentive to stick with your diet! It's a real oucher!
Oh yeah - and hopefully this will make you evaluate the way you are generally sit and improve that too.
Remember - these are all suggestions from some person on the internet! Make sure you make your own decisions and do your own research. I'm just telling you quickly what I would do myself if I were in your shoes.
On that note - I think the only thing a doctor would be able to do is surgery - which is truly awful and can leave a massive scar because of the nature of that canal - and still - there is a 50% chance you will get the infection again anyway.
Thank goodness there are at least some alternative avenues for you to explore.
Good luck box car!