Sir the reason for sudden occurrence of speech problems could be plenty, ranging right from migraines, to stroke, to stress, to some neurological disorder, and for same, we will advice you to get in touch with Speech Therapy doctors in Mumbai, or in any other city that you find convenient. Since the nature of your problem isn't clear therefore we can't arrive at any particular assumption as to how many sessions will be needed for you, but for a single consultation charges can be anything between Rs. 500 to Rs. 3,000.