Just prescribed 10 mg Doxepin for insomnia, do I need to hesitate?

I'm currently taking 54mg Concerta for adult ADD and was previously able to take Benedryl (same ingredients as Simply Sleep) for occasional insomnia caused by stress and anxiety but that no longer works and the insomnia has increased to a minimum of 4 to 5 nights a week along with increased anxiety from situational life stresses (work, bipolar son, etc..). I'm reading up on Doxepin since I've never heard of it and I hesitate to begin it. I need NO help with weight gain and I'm very uneasy with the many discussions I see in regards to overdoses, increase suicides, and not to mention the fact that yes it will help me with the edgy emotions I've been hit with since it is technically a drug for depression but one prescribed for those linked to substance abuse, I have an occasional tail or gl of wine and do no recreational drug abuse, I'm to busy obsessing about what I do need to take! Hmmmm...with all the newer medications out for both insomnia and depressions (minor on my list of please help me get healthy Dr) I'm a little perplexed that we would start with this..considering my first comment was..please don't prescribe me anything that's going to make me gain again. We went through many weight gaining anxiety meds to finally come across the correct diagnosis of ADD and Concerta so she is well aware of my history. Let's put it this way, we once tried Topomax for anxiety and insomnia, a med with a HUGE side effect of causing large amounts of weight loss, amount of 30-40 pounds for those on 1/2 the dose I was on. I was on 100mg for a year, it lost it's effect to manage my insomnia, and since I wasn't suffering from anxiety but rather ADD it never worked for that either...and yet never even received that side effect of weight loss either...not a single pound. But every single anxiety med that warned of a weight gain side effect..I was right there with it. I'm not questioning her intentions or her education...just curious on any other personal experiences....