A psychotherapist can help you but you need to have someone who is really experienced and is not there to just have a chat but will actually have ideas as to how to help you to change how you think and how you feel.
It sounds like you feel like you are spinning out of control because you are scared and it feels uncontained. A therapist who is able to hold strong boundaries will help you to feel safe again. Being able to talk honestly about your suicidal feelings will ease some of the burden you are feeling.
If I was working with you I'd been exploring what in your past has led you to feeling so uncontained and vulnerable. Having awareness of what is going on for you can be extremely validating and reassuring. It can help you to see a way forward. It must be very frightening to feel how you are feeling right now, but I hope it helps you to realise that you are not alone in feeling this way and that things can be different.
I would go on the BACP website or the Counselling Directory website to find someone. Speak to at least three therapists before arranging to see one. You can ask them how they would help you to feel more balanced right away (they should have some answers for this, around helping you to regulate your feelings and to calm your anxious bodily sensations) and then what strategy they would adopt to help you in the longer term (they should also have some ideas about this: which might include greater self awareness, psychoeducation so you understand better why you are feeling this way, working through any difficult past experiences, developing kinder self talk, having strategies to deal with anxiety, having a healthier lifestyle including better sleep and exercise routine - which have a massive impact on rates of anxiety and depression, establishing a greater sense of safety through the therapeutic relationship etc.)
The main message to take away from this is that things can be different. You don't have to always feel this way. There is hope out there but you just need to find the right therapist for you. Someone who is both effective and that you can trust to be open with.
In the mean time you might find it beneficial to watch some online youtube videos. Brad Yates has lots of EFT (tapping) videos. Many people find it calming to tap along to relaxing scripts that he gives. Emma McAdam does excellent videos on learning to contain and process your emotions Therapy in a Nutshell. Pete Walker has a page on his website about understanding and dealing with emotional flashbacks. Try doing some yoga or tai chi or swimming, anything that combines exercising the body with stilling the mind. If you like animals spend some time petting animals. If you like water, spend some time in the sea or a pool.
Good luck OP.