What Does Homeopahty Treat?
Homeopathy can successfully treat many chronic and acute diseases.  However the label of diseases are not very important in homeopathy because patients are treated as individuals, not as a collection of disease labels. Homeopathy can even treat that feeling "I know there's something wrong, but no-one seems to be able to find anything"
Homeopathy treats the root cause of the illness, not just the symptoms.  I have listed some diseases as an indicator to what homeopathy can treat:
Migraine, alopecia, asthma (especially in children), stress or depression, chronic chest infection, skin disorders (eczema, psoriasis, ringworm, etc) hyper acidity and other gastric problems, hormornal disturbances, vomiting (especially in pregnancy), kidney and gall stones, anaemia, sciatica, obesity, acne and freckles etc ... ... ...   the list is exhaustive!
 
How Soon Does Homeopathy Take Effect?
There is no certain time period or patent medicine courses in homepathic treatment.  Some patients feel feel the effects of the medicine immediately and some have to use the remedies for a longer period before they see some results.  The speed of recovery will depend upon the patient's immune system and the nature of their illness.  In acute/ short term diseases, results can be very fast take longer in chronic/long term diseases.