Inclusion Criteria:  Female patients and healthy controls 18-60 years old. Patients with moderate or severe MCS or multi-organ BDS. Symptoms present >6 months. Written and verbal informed consent and letter of authority.  Exclusion Criteria:  Before the beginning of the study; Current sinonasal illness or upper respiratory tract allergy.  Serious or unstable medical illness (e.g. Apoplexy, Parkinson's, Alzheimer's disease, ischemic extremity pain, renal failure, liver failure, epilepsy, and Raynaud's phenomenon) that is confirmed by medical history and, if possible, compared to medical records.  Current and previous diagnosis of mania, bipolar disorder, psychosis, severe agitation, imminent deliria, current suicide risk, alcohol or drug dependence (ICD-10). Confirmed by psychiatric history and, if possible, compared to psychiatric or medical records.  Pregnancy and lactation.  MR & MEG scanner incompatibility, assessed by an MR/MEG control questionnaire.  After the beginning of the study;  MRI diagnosis of incidental pathologic findings; Lesions, Hemorrhage, etc.  The onset of acute depression or serve anxiety. Relevant transference to treatment option should be initiated immediately.  Suicide risk (treatment will be initiated immediately).  Pregnancy and lactation.  The patient wishes to leave the study.  The patient cannot co-operate during the examination.