Well done for contacting your gp, intrusive thoughts are so common!! They can be very damaging, I’ve worked with patients who’ve had intrusive harmful thoughts of a violent/sexual nature, which as you can imagine can be very distressing, especially when the thoughts relate to family
Contacting Samaritans etc can be quite helpful if you’re in crisis, certain antidepressants can be more helpful with anxious thoughts e.g citalopram, so if the 50mg isn’t helping after a few weeks definitely go back to your gp! Don’t worry about being on diazepam, your gp has prescribed this for a reason, so it’s typically a small dose for a short period of time
Vivid dreams can be common too when people are feeling stressed/anxious. With lockdown etc I think visual dreams and intrusive thoughts are becoming more common! Both can be extremely distressing, rationalising your thoughts when you experience the thoughts can help “turn them on their head”. For example if you have an intrusive thought about hurting someone close to you, try and remind yourself “my brain is reacting to the physiological stress by playing tricks, this is only a thought, I am kind and empathetic, I would never hurt anyone close to me”. Easier said than done but with practice rationalisation can be very helpful