feeling depressed about published articles

I am a MSc graduate student, still trying to get a PhD position, but with no success at all. During and after my graduation I struggle to publish some articles (right now I got 6, mostly published in IEEE conferences or indexed in Scopus), but I do not feel happy at all.

The problem is that I see my publications as having a lack of public interest. I would like to publish more interesting, formal and mathematical stuff (I am in the field of Computer Science), but the problem that I have is that in my current place of work almost all my time is dedicated to lecturing. Also, and because I am working in a university of applied sciences; the research made here is highly applicable and less theoretical. All this things has put me in a state of deep depression.

What should I do to start looking to my research and my made publications with a different attitude? Should I seek for medical counselling?

Thanks