Hi all, just registered to tell my story and experience with tDCS.
I have recently been diagnosed with a tumor in my neck on my vagus nerve. The doctors think the risk is too great at the moment to operate, so I sit with a lot of symptoms, from my face being paralyzed on the left side, to my eyes just falling closed by themselves, and impossible to open them again, to severe tinnitus in my one ear.
Out of desperation, I started experimenting on myself. I first discovered if I pinched really hard on a couple of places on my face, I could open my eyes normal, but I had to keep the pressure up. So, I pinched a clothespin below my left eye, and as long as that pin was hanging there, I could use my eyes normally., but of course, it is quite painful, so I started thinking about stimulating the nerves electrically... I was desperate, anything to keep my eyes open I would have been happy with. First I started by hooking a signal generator up to 2 electrodes, stuck them above my eyes, and see if it has any effect. Signal was a 1Hz square wave with a 10% duty cycle, 3Vpp... great was my surprise when I immediately regained use of the left side of my face and my eyes.
Then I started thinking about the possibility of making a portable device, that I could wear permanently exciting those nerves. with further experimentation, I built a small, programmable system that worked. Then I discovered if I applied a very small DC current, after applying it for around 3 minutes, the effects would last longer. googled a bit, and then I discovered what I was doing, was tDCS.
I hook myself up for 1 hour in the morning, and for 10 hours I have almost full relief. After the second day, and a couple of burn marks later because I was still trying to come up with better electrodes, I discovered that my tinnitus also disappeared.
So, for me, tDCS is working. I cannot say it will/will not work for you, but for me it took me from being unable to open my eyes, paralysis on the left side of my face, severe tinnitus to a (almost) normal state.
P.S. I am an electronic engineer and have also studied human physiology, so I have a fair idea what I am doing, lol....