Thanks to all of you for your advice. I am reading the whole time experience reports from others on the internet and am struggling with myself how to go on.
To some of your questions:
I can not talk to a supervisor because there is none. My contact is the owner of the company and he is also the one i have my problems with. There is no union or work council although the company is middle sized. We always had great fluctuation of employees. It is like Hspencer mentionend a "one complaint and your gone" company. Thats another reason why i try to keep my monthly expenses at a low level.
I see some dark clouds in the immediate future. 2 Co-workers quit in this year and we cant compensate them because we already work from 8 to 6 as well as we do uncompensated overtime + callings on weekends and on vacation days. Because of this i feel exhausted and not in best shape.
I can answer hspencers first questions with yes, the future outlook is not positive, the people we work for are overbearing (the coworkers are nice ;) ) and we do a lot of hours (+uncompensated overtime) but the salary is always there in time.
I am certain i will be offered a bigger salary if i quit to keep me in the company till i am replaced. There are no people in line waiting to do my present work.
The potential for a new job is not so bad. I am single and able (but not so willing) to move.
Here in Germany you have the opportunity to start your own business if you are unemployed. You will get 60% of your last salary(after tax) + 300euro every month for about 1 year . This will be enough even to save some money. If i quit by myself i have to bypass 3 months without any income. This is an emergency plan without exactly knowing what i will be doing for a business.
I think i have to develop a plan b which maybe is to move and do a job like my present one somewhere else if i cant generate enough income streams within a year.
My "deadline" to quit is next friday. If i pass this date i have to be in the company during the worst time in the year. The hint to the cyclical feelings in the job is justified so i try to think about my options till friday.
Thanks a lot for listening to me complaining about my job ;)
Thanks also for the link to firecalc.com. I went there but wanted to reply here first. Tomorrow i can take a closer look.