Honestly it is better not to mine using Raspberry Pi right now as it is not profitable. It is suggested to go for other rigs.

Plenty of them if you observe. Cheap money transfer for any amount is bitcoin's thing. It also provides effortless sercure transaction which is why people are attracted to it.

It's easier said than done, mate. Specially if you don't lose significant. It's ok to panic but what must be done is to follow the original goal. Sometimes you have make the hard choices. Sometimes a too much holding is a total disaster. You have to be smart, be aware of the situation in every minute and must have good relevant knowledge to judge your actions correctly.