Are anxiety, distress, inability to remember or express oneself and understand simple matters, in addition to repeated refusal of marriage due to health conditions, considered a tribulation, and what is the advice?

Whatever affliction befalls a Muslim is a trial from Allah, and whoever patiently perseveres and seeks recompense from Allah will have a great reward. It is advised to have a good opinion of Allah, to rely on Him, to supplicate at times when prayers are answered, to be content with what Allah has decreed, to trust in the possibility of treatment and change, to seek help from educational books, and not to despair or lose hope; for what is averted from a person may be better for him.