I am person who is really affected by severe OCD and sometimes I can’t think reasonably and straight, but I have still a good sense of reality and I still know what is real and not. Does it consider me a Majnoon and am i excused from the wajibat and other obligation?

No you are not considered a Majnoon and the obligations still are applicable to you. Majnoon is the one who has no sense or Taklif. Now if you find that the obligations are exacerbating your OCD, or because of the OCD they are becoming unbearable, do your best to do them as much as you are able to. Do them step by step and never doubt their validity. Always say to yourself: Allah will accept them and He has commanded me to ignore my OCD and consider my deeds valid.