Welcome to MedHelp Lyme --
I am sorry to hear you are ill. Sadly, many of us have experienced symptoms and problems very similar to yours, so I think you are wise to continue pressing ahead to find out what is going on.
Many of us never saw a tick, and in winter ticks are still around, on pets and people both. In North America, the tick that carries Lyme is usually a very tiny one, like the period at the end of a sentence, so it is not uncommon not to see the tick. Also, perhaps half of us (or more! who knows) never have a rash either, but mainstream medicine still usually requires a tick and a (round, bullseye-shaped) rash for diagnosis.
I just searched online for "lyme europe" [but without the "quotes"] and found a number of websites that may be helpful to you, much like this MedHelp site, only they will be better able to connect you with resources near where you are.
Finding an understanding and broadminded medical doctor is the first and most important step, so I urge you to do that in parallel with the appointment you have pending. The faster you move against whatever infection you have, the better.
I understand that there are different strains of the Lyme bacteria in Europe than in the US, but the issues are the same. Your MD should also consider possible co-infections carried by the same ticks (or other insects, like your mosquito; I am not persuaded ticks are the only vector) and run tests for those other illnesses which your symptom constellation suggests. In the US, about half of the Lyme ticks are said to carry co-infections. Co-infections must be tested for separately and sometimes require different treatment as well.
For what comfort it is, all your symptoms I have either had myself or know someone who has. Everyone is different in how they express the infection, and co-infections complicate the picture, which is why an experienced Lyme specialist is so important to locate.
I gather that the UK MDs are not keen on diagnosing Lyme, but I believe there has been a good bit of work done in Germany on the topic. I don't know about the Netherlands.
Lymeneteurope [dot] org pops up in the search list at or near the top -- do a search and see what you come up with.
The premier group of Lyme specialists in the US is ILADS [dot] org. Under the tab 'about Lyme' at that website, you will find lots of information.
About having already taken some antibiotics, that would not necessarily produce a negative test result, but in fact might do the opposite. Lyme has a unusually slow reproductive cycle (like leprosy and tuberculosis bacteria, which also divide very slowly), and long courses of antibiotics are the usual treatment (a year or more, depending on response and co-infection status). Thus a short course of antibiotics are not likely to give you a false negative ... that said, however, Lyme has a trick of sequestering itself in so-called 'bio-films', slimy structures that hide the Lyme from the immune system, so false negative test results are not uncommon. Another aspect is that when testing is done after a short course of effective antibiotics, the test results may actually be more positive, because the antibiotics may stir the immune system to produce antibodies. Rather complex, you can see.
There is a lab in California called IGeneX that runs a blood test different in nature from the usual ELISA/Western blot tests used here (I don't know what's usual in Europe). Lyme specialists (often called by patients as a shorthand identified LLMDs, for Lyme-literate MDs) often use IGeneX testing, as it is more reliable and descriptive. They have a website if you want to read up on their testing approach.
I am NOT medically trained, but have been around Lyme for several years, among my friends and family and myself, so what I say above is not necessarily medically accurate, but reflects what I have encountered. Check out the websites online, and take it from there. You sound well equipped mentally (tough and determined) to deal with it.
Let us know how you do and if you need anything further. Best wishes -- and don't give up!
In fact a classic example of my recent forgetfulness.
I'm not 33, I was 36 last week. :(
Myself