Defo seems like its building up to something and it does sound like its overdue a biggie, I wouldn't be worried, there is not much we can do about it. When will it go up ... I don't think the experts really know and they have said as such in reports today. I understand this volcano is often more active in the autumn. I did read somewhere that if it goes up you should be able to hear the explosion as far away as Paris. No idea if that's really true or not.