I found SSRI's make my depression worse not better, and I have a low tolerance for many drugs - a half dose usually does for me what a full dose would do for others.
All drugs, even vitamins, supplements, and changes in diet have side effects, so it will always be a balancing act whatever you do.
I find St Johns wort (Hypericum), fish oil, vitamin D, along with other vitamins and minerals help, and also a good daily dose of yoghurt and probiotic drinks.
Most important though is exercise; at least every other day; as you need to work off the stress hormones through physical exertion, otherwise they will only exacerbate depression and anxiety.
I'm experimenting with the 5/2 diet as well, as this seems to be making a big difference in my tolerance level, my general mood, and stops my depression from taking a hold.
All of these things work for me at present, but may not in the future.
I would recommend if making any changes or starting any regimen like I have that it be discussed and closely monitored by a health professional.
I also take Phenergan, which is an over the counter Pharmacy only medication which treats Hay fever, and has mild sedative qualities; I take this if my hay fever is bothering me, or if I can't shake feeling restless, though I take a very low dose of this, and usually only at night, unless I have a major stressor feeding my anxiety and depression.
I hope that helps.