I've had several bad experiences with doctors.
There was one doctor who prescribed me antibiotics for an infection in a cut from where I'd fallen on some broken glass. Four hours later when I started throwing up blood he cancelled all his afternoon appointments and rushed over to our house, told my dad he'd given me the wrong antibiotics and for me to stop taking them and if I hadn't stopped throwing up in 4 hours to take me to A&E. Didn't replace the wrong antibiotics with the right ones though, had to go back three days later when I'd fully recovered with the cut on my foot like 'It's still infected!'
The same doctor about 3 years later diagnosed me with a possible DVT because I had moderate pain in my knee that hadn't gone away for 2 weeks and I was on the pill. 3 hours in A&E to be sent home with a tubigrip and the doctor at A&E was like 'We have a dedicated clinic upstairs for people with suspected DVT, they've just sent me down from there, your GP could have just made you an appointment there for tomorrow morning and you wouldn't have had to wait around, but the pain isn't in the right place and you're only 17 years old so it's very unlikely to be a DVT'. Brilliant.
This doctor's wife (also a doctor at the surgery) has several times tried to take my mum off her antidepressants because when she goes in she 'seems like she's not depressed'. Well yeah love, that's the antidepressants...
Another doctor at the same surgery I had to see for a doctors note to be able to get rest breaks for the same knee pain the first doctor thought was a DVT, which was later diagnosed by a specialist. After 20 minutes of going around and around in circles and me being reduced to tears, he finally listened to more than half a sentence at a time and we were done in 2 minutes.
All three of these doctors saw me for a condition (still undiagnosed) in my hands, the first prescribed ibuprofen even after me saying it gave me indigestion last time and I ended up in hospital with a suspected stomach ulcer, the second two prescribed the same anti-inflammatory drug (obviously different to ibuprofen, can't remember what it was except that it cleared up my pulled muscle in my leg, but did nothing for my hands). The female doctor prescribed it twice with the other doctor prescribing it between those two appointments; was told 'It needs more time to work'. My hands were not and have never been swollen!
A fourth doctor wrote down that I was a hypochondriac with mild pain, after I told him I was sometimes in too much pain to dress myself in the morning and struggled to comb my hair so every morning weighed up whether or not to wear a shower cap and just leave my hair as it is.
It was the fifth GP who sent me for blood tests, an X-Ray, physiotherapy, hand splints and a rheumatology appointment. She is fantastic! There's still no diagnosis, but she's corrected what the fourth guy wrote and put me down as moderate to severe and prescribed strong pain killers for the short-term until there's something that they can do long-term. Going back to see her next week.