There's a personal and a professional side to it.
Personally, ensure that you have a comfortable balance of taking stuff in (e.g. television, reading, movies, music), putting stuff out (e.g. writing, painting, photography, dancing, gardening) and physical exertion (e.g. sports, fitness, dancing, walking). If one of those is completely lacking we've found that people also feel less effective/good on the other areas. Spending time on physical exertion (if you're doing absolutely none) will quickly be increasing your energy on the other areas as well.
Tied into especially physical exertion and taking stuff in is also diet. Watch what you eat and avoid the sugar rush and crash (no need to avoid sugar altogether, pace it). Besides that you might want to have a look at the low level composition of your diet, and might try your hand at vitamins B11, B12 and iron supplements. However, only do the latter if you know you're not messing with medication or medical conditions.
Professionally, obtain clarity on the following:
- what is your defined and agreed job? (Job description, procedural expectations)
- what are you actually doing?
- what do people expect of you?
Determine the delta between 1 and 2 to see whether you are doing more than the agreed baseline. If push-comes to shove you can hide (for a while) behind your documented baseline. This is temporary when 3 exceeds 1, as they will find a way to assign it to you in the proper way if they really need it (usually through the procedures).
Determine the delta between 1 and 3 to see whether you are recompensed and resourced appropriately. If training/supervision is a new or additional responsibility then you can make the case that you need to alot specific time to it, and thus reduce time on other items, or that you obtain more ways to deal with the increased stress (e.g. additional vacation days, training on how to efficiently deal with the matter)
Determine the delta between 2 and 3 to see whether you are doing more/better than you need to (internally motivated people often suffer this)
Additionally, learn to say no (you can think f*** that, but say no) at the beginning of truly impossible or inappropriate assignments/expectations. Also say it to yourself if you're working overhours continuously. Overhours should be an exceptional response to exceptional circumstances. If it is a regular response, you will not fix it with more overhours and are only likely to make it worse as you become less efficient, less effective or even have people fully dropping out after a while.
Long-term: Discuss with your direct manager on adopting a management style based on mission-type tactics (
auftragstaktik). It needs the full set of conditions, including the right for you to 'refuse' based on current inability to accomplish a 'mission' and a growth-path that aligns team-members. There's a lot to it, but it provides clarity and reduced burden.
Besides these generic matters you mention managing temporary personnel. This is a specific topic that needs more information for advice: i.e. is this policy-based turn-over, or feelings of fear for being fired you need to deal with for them, how does training for these look like. What kind of issues drain you on this?
Lastly you mention conflict. That can exhaust someone quickly. Elsmar might be able to advise a way forward/out, but might fall under privileged information. Share what you feel comfortable with but nothing of direct value can be given on conflict in general.