In ability to formulate words is known as aphasia. This usually occurs due to a brain lesion like a bleed or an area of poor blood supply. Hence a MRI of brain is a must. This is of two types: nonfluent aphasia where the individual is unable to formulate the word he or she knows and wants to say; the other is fluent aphasia where the word formulation is incorrect.
It is also found in people with lupus, Sjogren's Syndrome, and Hashimotos thyroiditis. Hence all these need to be ruled out. A speech-language pathologist must be consulted to chalk out a program to help you with recovery. You will be taught to communicate by other means in situations where you fail to find the right word. Apart from this you also have problem with comprehending auditory signals and converting them to written speech. This would also need to be tackled by speech-language pathologist.
Since a confirmed diagnosis cannot be given on net please consult your doctor regarding this. Hope this helps. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
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