Firstly, they are not called pellets, but are either tablets, large soft tablets, pillules, tinctures or powders.
Yes, Belladonna tablets that have been potentised (homeopathic) are safe to take in a low potency on a daily basis. It has to be a low potency such as a 3 or 6c, as by taking it this way, it has a specific target area of the body and has a more physical effect. If you take a higher potency on a daily basis, then you are at risk of proving the remedy. This means that you will eventually elicit the symptom picture of the remedy.
Having said that, if you take a low dose as needed or once or twice daily, then you should be ok.
You can also try the Nux Vomica that I also suggested.
I would just like to point out one more thing. Symptom control is ok with homeopathy, but it is not really how it was designed to be used. It was designed to be used by treating the whole person and taking all symptoms into account and then prescribing what is called a Constitutional or Totality remedy. This means taking into account mental/emotional, general and physical symptoms together.
If you do this and you are given one remedy, then you have more chance of recovery. Doing it the other way, using either the Belladonna or Nux Vomica for symptomatic relief, then you could be taking this for a very long time.
I would suggest that you either go and see an ND, who practices alternative therapies such as herbal medicine, homeopathy and acupuncture or try and find a fully qualified homeopathy in your area. At least way, you have a better chance of finding a cure by treating the cause rather than just the symptoms.