As irritating as this may be - I think you're probably better at judging how concerned you should be. Certainly I would imagine that being aware of what you are doing is, in the very least, a positive, and opens the potential to self-reflect on the reasons for why you have started this behaviour.

In a way how dangerous it is likely depends on how you can act when you are less rational - e.g. are you impulsive?....do you retain information and could you foresee yourself using the information gained to hurt yourself in a dangerous way in the future? etc. Are you able to notice when you slip into an 'at risk' time? Do you have a crisis plan or at least key people to talk to at these times?

For me, sometimes doing things like this are indicative of me needing an outlet. It can indicate my depression is worse - or at least my stress levels/ability to cope is being stretched. My suicidal thought often skyrocket when stressed out and I feel unable to problem solve my way through a situation. Realising I'm doing things like research therefore makes me realise I've perhaps need some extra support....so in many senses I don't consider it a particularly negative coping strategy, although I get how scary it can be when it seems so rationally performed! But, caveat is that this is only how it works personally for me...you may be different and it might indicate other things....

Do you have a therapist? There will be no harm in telling your pdr - I'd imagine it's best to say than to not...but a therapist may help you dissect why this is happening and that may offer you a greater sense of understanding and control over the situation in the long term.

I hope if you ever have the urge to act on your newly researched information, you also give yourself the chance to get help beforehand!