Keep in mind that SSRI drugs do NOT increase serotonin in the brain. They increase the time the serotonin you have stays in the synapse (it is not taken up back into the cell).

In fact over time the cells sense this and stop making more serotonin.

Another way to get more serotonin is to provide L-tryptophan.
This supplement can be as effective as the drugs in fact.

There can be a troubling movement disorder side effect with SSRIs over time. Typically these show up after 6months or so.
This involves dopamine which for some reason goes down in long term SSRI users. The first symptoms involve the face, mouth and neck, and resemble tardive ones. Some people get Restless Leg syndrome too. Why the brain reduces dopamine in response to SSRIs is not well understood, but serotonin may be necessary for the dopamine pump.

So the honeymoon you have now may end, later on. Watch out for it. Sometimes it is only jaw clenching, but it may be worse, involve the tic-like movements.

This is an old paper:
http://www.ncbi.nlm.nih.gov/pubmed/9640489