Emm, please get this looked at, it's not good at all.
Vomitting with a band should be avoided as much as possible, the blood is from the oesphagus and can be a sign of damage.
Also band can slip if heavy or prolonged vomitting has occured.
You really need to look after yourself so much more Emm, be kinder to yourself, it sounded to me like you needed a de-fill ages ago.
You really need to see your provider and get this sorted, being too tight won't allow you to loose weight and you will also get malnourished.
Call them tomorrow and get an appointment...hugs to you xx