Are there any remembrances (dhikr) from the Quran and Sunnah or other solutions for the problem of difficulty in speaking and stumbling in speech, which may arise from shyness or imagining the opinions of others?

It is necessary to avoid speaking with foreign women unless there is a need, and it should be limited to the extent of that need, while avoiding temptation; because of the Almighty's saying: "And when you ask [his wives] for something, ask them from behind a partition. That is purer for your hearts and their hearts." The treatment for shyness is strengthening faith and trust in Allah, abandoning obsessive thoughts, observing the obligatory prayers, and increasing good deeds such as charity, night vigil prayers (Qiyam al-Layl), supplication (Du'a), and remembrance (Dhikr). One may also consult psychiatrists.