I agree with the others. Feelings about pretty much anything come and go. There are times when they are stronger and times when they wane again. You had an intense session and processed some of it, and the emotions waned for a while. There is nothing wrong with that at all - it is a *good* thing for the intense feelings to recede for a while. Human beings suffer negative health effects from the physiological stress of sustained intense emotions. It just isn't good for us.

Journaling helped me a lot in t. I think sometimes it is easy to get caught up in the ins and outs of the T relationship, but the most powerful growth tends to come when we process things slowly on our own. Growth doesn't occur as a direct result of the relationship - it is the inner changes that come from the processing of the material and therapeutic relationship that give rise to personal growth.

Processing results in change, and I think sometimes emailing can block that progress. Journaling allows things to be expressed and then left alone for a while. Later - perhaps an hour or two or even a few days - you can return to it, re-think it, process it some more and perhaps even have more insights or come to a different understanding yet again. Journaling gives the space for gradual processing that builds upon itself, without an end point or a pause.
On the other hand email sets the understanding of that moment in stone, and requires waiting for a response. It can set that moment of understanding as *the* new reality, and doesn't lend itself as readily to further processing or growth until the other person has responded in some manner.