My feelings won’t last forever.

One of the cruellest features of a strong feeling is that it arrives with a claim about the future attached. Despair doesn't present as today's weather. It presents as the permanent climate.

Watch the actual graph across a single day, though.

Most people have a worst hour and a best hour, and they are often six hours apart, with nothing in the situation having changed between them.

That doesn't make the feeling wrong or small. It means the part of it that says always is the least reliable part — and it's the part making tonight so hard to sit through.