apushata, yes I understood TRUEB as you did.
As for Sam & rationalf, I don’t think an “eis tzarah” is understood as an individual in need of a shidduch (or an individual in need of anything else he feels is important to him). AFAIK an eis tzara is a time when the future of Am Yisrael collectively is at stake. Correct me if you think I’m wrong.
Tefillah b’eis tzara is certainly of great importance. Our chachamim have also instituted other standardized Tefillos for us. But an individual should not pray for his needs after exhausting all other possibilities. Our bakashos should be an ongoing part of our daily communication with our Creator.