When you get the understanding that your PhD is only one small talking turn in the big scientific world and soon is it collecting dust on your shelf or is never printed out from the digi world, then your stress about the whole thing disappears. Normally, nobody is impressed and nobody remembers it in the long run.
PhD stress is usual during the first 1 to 1.5 year., however it could be relaxed by finding out the research questions and optimal ways of its possible solutions. Most of the PhD researchers feeling/deeming it hard on how to find the research question for the assigned topic?
It is not too hard!
In literature review, just put attention on about 5 to 10 years related research, here read/note "Conclusion & Future work" of all of these manuscripts....your research questions to solve may mostly be from here. If the research question is already known, it is than simply to find all the possible ways of solution, and to select the super optimal ones for your own project.
During the PhD, stress is invited if and only if the physical and mental orientation is made vulnerable for it. If the entire PhD is addressed holistically intertwined with normal lifestyle, then things become very simple, enjoyable and satisfying to plan, execute and revisit after a while only to redefine and restart afresh.
Where is the location of stress, then?
But, of course, if stress appear, by chance,......it is to be handled by management of time, body and mental orientation....with tools like zeal, energy, laughter, meditation, yoga, commitment and positivity.
music .... by stimulating the secretion of immunoglobulin Ig-A ... it reduces the physiological stress ..... and, implicitly, the psychological stress.