So first duel my character is wounded.
Second one severely wounded.
Thanks to that my fighting skills plummeted but i still must face impossible duels twice every month without any respite or time to heal? No one finds ridiculous?
You don't have to take the duels immediately. You don't have to take them at all, unless you are ready. I usually don't duel and don't lead troops during a war, if I'm wounded, stressed or depressed or have any other removable negative health modifier.
There are ways to improve your health (faster healing) and martial skill.
Health improvement: hunting, theology and family focus; pets (e.g., dog from hunting); asking for a long and healthy life from ancestors when wounded; martial specialisation (attainable from martial education and martial guardians/educators) can also improve your health; hunting focus can also trigger an event that makes you brawny. This event can be triggered, when marching troops during a war, as well.
Martial skill improvement: hunting and war focus events, weapons, armor, dueling, choosing a military aspect at the hero rank (duelist provides the highest PC bonus). It's risky, but you can also antagonize and become rivals with weaker opponents, then duel them. There are also warrior lodge events that can make you brave, ambitious and diligent. Learning focus can also make you diligent. Diligent, ambitious and patient improve all stats.
Bottom line: play it safe, take your time.