Nerve conduction tests query please

After 7 months of barely being able to walk finally today got a Lumbar Puncture. :( Apparently there was blood mixed in with the spinal fluid and it won't test properly so I will have to have another - shittiest thing ever and I do not want another one! But, having a nerve conduction test on Thursday and wondered what I am in store for - not so bad? After getting no help for so long and having so much go wrong with myself my nerves seem really frayed and I am feeling anxious about this. Thanks.